Heated multistage press with synchronized closing device



March 11,` 1969 w. Hu'r'rr-:R 3,431,838

HEATED MULTISTAGE PRESS WITH SYNCHRONIZED CLOSING DEVICE Filed Feb. 8. 1967 Sheet ors Mrch l l, 1969 yW. HUTTER 3,431,838

HEATED MULTISTAGE PRESS WITH SYNCHRONIZED CLOSING DEVICE Filed Feb. 5. 1967 Sheet 2 of 3 March 1l, 1969 w. HuTrr-:R 3,431,838

HEATED MULTISTAGE PRESS WITH SYNCHRONIZED CLOSING DEVICE Filed Feb. 5. 1957 Sheet 3 0f 3 F/G. a

/A/vf/vaP wunem nii-fren svz United States Patent O 3 Claims ABSTRACT F THE DISCLOSURE A heated multistage press provided with synchronized closing means wherein the conduits vfor introduction and withdrawal of the heating medium are within these closing means. This assures considerable savings in space for these conduits and facilitates the loading of the press.

The invention concerns itself with heated multistage presses provided with synchronized closing devices. The prior art teaches many modes, of construcion for the simultaneous opening and closing of all stages of such presses. The hitherto most satisfactory construction provides one horizontally swingable arm each on the opposite sides of the upper pressure plate and a plunger at the lower, raisable and depressable, plate (the press table), linked to the free end of the corresponding arm. The latter are linked to the individual press plates by tension members, preferably pull rods. The tension mem- Ibers engage the corresponding arms at proportionally greater distances in the sequence of the plates, taken downwardly from the uppermost plate. In heatable presses as just described, the inlet and output pipes for the heating media circulating through the plates require considerable space on the press. The space requirements become the larger, the more plates there are in the press.

It is the object of this invention to overcome these drawbacks by placing the inlet and outlet means for the circulating heating medium on and/or within the synchronized closing device. This practically averts any additional space requirement for the conduits and thus facilitates rea-dy loading of the press.

In a preferred embodiment, the plungers are tubular and are connected, at one end, with the plates to be heated, by llexible tubing and, at the opposite end, also by exible tubing, with a stationary conduit, disposed on the swingable arm. The use of tubular plunger and pull rods, serving as conduits, considerably simplies the construction of the press.

The invention now will be further explained with reference to the accompanying drawings. However, it should be understood that these relate to preferred embodiments and that it is intended to cover all changes and modifications of the examples selected which are within the scope and the spirit of the invention as hereinafter claimed.

In the drawings:

FIGS. 1 and la are schematics of a front elevation of a multistage press in open and closed positions of the press, respectively.

FIG. 2 is a schematic of part of the press in open position, on an enlarged scale, as compared to FIG. l.

Referring now to these drawings, the multistage press in FIG. 1 consists of a frame 1 carrying the stationary pressure plate 2 and the lower plate 3 which is the press table and can be raised and lowered. Hydraulic cylinders 4 are provided for the upward stroke (the working stroke) of press table 3 and its return for opening of the press. Taken from the top of the press, the reference numerals 3,431,838 Patented Mar. 11, 1969 5 and 6 denote the cover plates of the individual stages. It should be noted that, for the sake of convenience, only six stages have been illustrated, but that any number of plates may be provided, e.g., twenty plates or even more. The cover plate 5 is rigidly connected to pressure plate 2, and base plate 8 of the lowest stage is rigidly connected to press table 3.

On each longitudinal side of the press, pressure plate 2 carries two forked arms 9 which are swingable about a horizontal axis 10. At the free end of each arm 9 a plunger 12 is linked thereto at 11 whose lower end is hinged to press table 3 at 13. The rods 14, linked to the assigned plates at 15, serve to stop and lift the plates 6, which, when the press is open, can rest on supports on frame 1, as is known per se.

Each of the rods 14 is provided with `a tightening device 1-6, eg., a spanner or turnbuckle, so that they can be exactly adjusted to a predetermined length. Each rod 14 also has an equalizer 17 assigned to it which serves to compensate for unequal filling of the individual press Stages.

FIG. 2 illustrates the disposition of the inlet and outlet means for the heating medium circulating through the stages of the press. Frame 1 carries a central distributing conduit 18 which leads to the upper cover plate 5 by a rigid conduit. Conduit 18 is provided with a distributor piece 19 from which a flexible hose 20 leads to conduit 21. The latter is xedly disposed on the arm 9. Rigid pipes 22 branch oil conduit 21 and carry at their respec.- tive lower ends flexible hoses 23, each connected to a rod 14. The latter have a central bore 24 through which the heating medium flows and thence to heating plates 6 by way of further flexible hoses 25.

The withdrawal of the heating medium circulating through the heating plates 6 is carried out, eg., through the arms 9, rods 14, etc., on the opposie side of the press. The base plate 8 also can be included in the heating cycle, in which case the medium is introduced through plunger 12. This is not necessary when the lowest stage is not loaded with material.

I claim as my invention:

1. In a heated mul'istage press with synchronized closing means, said press having a frame; a plurality of press plates therein; an upper pressure plate and a cover plate connected to said pressure plate; a press table at the bottom of the Press; means for acuating said press table; at least one arm on each side of said pressure plate, swingable about a horizontal axis on said frame; a plunger connecting each arm with said press table; a pull rod for each press plate connecting the same wih sail arm; said press plates being adapted to have a heating medium circulated therethrough; and inlet and outlet means for said medium; the improvement which comprises said arms carrying a conduit connected to said inlet and outlet means; said pull rods being hollow and connected to said conduit and to said press plates so as to convey said heating medium thereto; and means to withdraw said medium through the corresponding componens at the opposite side of the press.

2. The press as delined in claim 1, wherein said inlet means are a central inlet tube disposed on the upper part of said frame and leading to said cover plate; a distributor piece within the line of said inlet tube; a flexible hose connecting said distributor piece with said conduit; the connections between said pull rods and said press plates and at least part of the connections with said conduit also being exible hose. l

3. The press as dened in claim 1, wherein said press table carries a heatable base plate; said plungers being 3 connected to said conduits and to said base plate; said plungers also being hollow; one plunger being the inlet and the other the outlet for said medium into and out of said base plate.

References Cited UNITED STATES PATENTS 1,854,341 4/1932 Laussucq 10o-93 XR 2,094,862 10/1937 Weich 10o-200 XR 2,172,003 9/1939 Stanley er a1. 100-199 XR 10/1940 Quick 100-199 XR 8/1965 Hammon et al. 100-200 XR 6/1967 Cizek 100-93 1/1968 Carlsson et al 100-200 U.S. Cl. X.R. 

